title: Surface antigens on mouse natural killer cells: use of monoclonal antibodies to inhibit or to enrich cytotoxic activity.
abstract: In studies using monoclonal antibodies to cell-surface antigens we have identified 2 new antigens (H11 and 7.2) expressed on mouse NK cells. These are shared with T cells but not B cells. We have also shown that NK cells express T200 but lack detectable ThB or Lyt-1. The T200 and H11 surface molecules were implicated in the mediation or regulation of natural killing; monoclonal antibodies to T200 and H11 inhibited natural killing when added to the cytotoxicity assay but did not interfere with T cell cytotoxicity against the same target. The inhibitory effect of anti-T200 is consistent with recent evidence showing that antibodies to the Ly-5 polymorphic determinant on T200 block natural killing. The H11 determinants is on a different molecule. The absence of Lyt-1 and ThB on NK cells permitted development of a rapid and simple method for separating NK cells from T cells and B cells. Spleen cells incubated with rat monoclonal antibodies to Lyt-1 (on all T cells) and ThB (on all B cells) were 95% removed by adherence to Petri dishes coated with antiserum to rat immunoglobulin. The natural killer activity in the nonadherent population was enriched 16-fold.
mesh_terms: D000818:Animals; D000906:Antibodies / Q000494:pharmacology*; D000911:Antibodies, Monoclonal; D000954:Antigens, Surface; D003165:Complement System Proteins; D003602:Cytotoxicity, Immunologic; D007694:Killer Cells, Natural / Q000276:immunology*; D051379:Mice; D008806:Mice, Inbred AKR; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008808:Mice, Inbred CBA; D051381:Rats; D013154:Spleen / Q000276:immunology
chemical_list: D000906:Antibodies; D000911:Antibodies, Monoclonal; D000954:Antigens, Surface; D003165:Complement System Proteins